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Image processing apparatus, image processing method, display panel driver and display apparatus

Active Publication Date: 2015-08-13
SYNAPTICS JAPAN GK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent talks about a technique that can make pictures look better by making them brighter while maintaining their color.

Problems solved by technology

However, in this technique, the light flux of the backlight attenuates largely due to the filter so that the backlight power has to be increased to keep same brightness of the image.
However, one problem in the technique of expanding only the saturation component S while the hue component H and the value component V are saved, as disclosed in Patent Literature 1, is that the brightness declines to darken the image by saturation emphasis.

Method used

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  • Image processing apparatus, image processing method, display panel driver and display apparatus
  • Image processing apparatus, image processing method, display panel driver and display apparatus
  • Image processing apparatus, image processing method, display panel driver and display apparatus

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first embodiment

[0064]FIG. 6 is a conceptual diagram showing the saturation expansion processing that is carried out in a first, embodiment. In the saturation expansion processing of the first embodiment, the operation processing is carried out in which the saturation component S is not expanded while saving the value component V but the saturation component S is expanded while saving the brightness Y. In other words, in the first embodiment, the calculation of expanding the saturation component S is carried out while saving the reference value C, and in the calculation, the brightness Y is used as the reference value C.

[0065]FIG. 7 is a conceptual diagram showing a technical idea of the saturation expansion processing of the present embodiment. In the present embodiment, when the saturation expansion processing is carried out, the brightness compensation is carried out such that the brightness Y is saved to each of the R data, the C data, and the B data, as compared with the saturation expansion p...

second embodiment

[0099]In a second embodiment, the saturation expansion processing is carried out to expand the saturation component S while saving the reference value C. However, in the second embodiment, the reference value C is calculated as a weighted average of the value component V and the brightness Y. That is, in the second embodiment, the saturation expansion processing is carried out like the first embodiment while using the reference value C that is calculated as the weighted average of value component V and the brightness component Y instead of the brightness component Y.

[0100]In this case, the value component V is the maximum value of the R data, the G data, the B data of the RGB data (reference to equation (1-1)), and the brightness Y is calculated as the weighted average of the R data, the G data, the B data. Therefore, note that even in case that the reference value C is calculated as the weighted average of the value component V and the brightness Y, the reference value C is the wei...

third embodiment

[0122]FIG. 13 to FIG. 15 are diagrams to describe the technical features of the saturation expansion processing in a third embodiment. In the saturation expansion processing in the first and second embodiments, the values of the R data, the G data, the B data of the RGB data after saturation expansion sometimes become smaller than a lower limit value RGB_MIN or become greater than an upper limit value RGB_MAX. Here, the lower limit value RGB_MIN is “0” generally and the upper limit value RGB_MAX is a value that is determined according to the bit width of the R data, the G data, and the B data. In case that each of the R data, the G data, and the B data is n-bit data, the lower limit value RGB_MIN is “0” and the upper limit value RGB_MAX is 2n−1.

[0123]Referring to FIG. 13, for example, consider a case that each of the values of the R data, the G data, and the B data is expressed in 8 bits. In this case, each of the R data, the G data, and the B data of the RGB data is given as a valu...

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Abstract

An image processing apparatus includes a reference value calculating section configured to generate a value that is a weighted average of values of R data, G data, and B data of original RGB data as a reference value. Regarding each of color data such as the R data, the G data, and the B data, a value is calculated that is coincident with a value obtained by adding the value of the color data of the original RGB data to a product of a difference obtained by subtracting the reference value from the value of the color data of the original RGB data and a predetermined coefficient, as a value of the color data of RGB data after saturation expansion.

Description

CROSS-REFERENCE[0001]This application is based on and claims the benefit of priority from Japanese Patent Application No. JP 2014-023878, filed Feb. 10, 2014. The disclosure thereof is incorporated herein by reference.TECHNICAL FIELD[0002]The present invention is related to an image processing apparatus, an image processing method, a display panel driver and a display apparatus, especially to an image processing apparatus and an image processing method, which carry out operation processing to expand the saturation of image data corresponding to a display image, and a display panel driver and a display apparatus using the same.BACKGROUND ART[0003]In a display apparatus in which a color area is relatively narrow, there is a case that operation processing of expanding (emphasizing) the saturation (hereinafter, to be referred to as “saturation expansion processing”) is carried out to image data corresponding to a display image. For example, a liquid crystal display apparatus, which uses...

Claims

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Application Information

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IPC IPC(8): G06T11/00G09G5/02
CPCG06T11/001G06T2200/28G09G5/02H04N1/6027G09G3/3607G09G2340/06G09G2360/16H04N1/60
Inventor OKAWA, MASAAKINOSE, TAKASHIFURIHATA, HIROBUMISUGIYAMA, AKIOKUROKAWA, YOSHIKI
Owner SYNAPTICS JAPAN GK
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